Integrate xkivik repo into this one

[flimzy]

No description provided.

[codecov]

Codecov Report

Patch coverage: 84.90% and project coverage change: -1.15% ⚠️

Comparison is base (b88e609) 80.48% compared to head (4179069) 79.34%.

❗ Current head 4179069 differs from pull request most recent head e586715. Consider uploading reports for the commit e586715 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #749      +/-   ##
==========================================
- Coverage   80.48%   79.34%   -1.15%     
==========================================
  Files         116      164      +48     
  Lines       10661    12926    +2265     
==========================================
+ Hits         8581    10256    +1675     
- Misses       1762     2233     +471     
- Partials      318      437     +119     

Files Changed	Coverage Δ
cmd/kivik/cmd/put_config.go	70.00% <70.00%> (ø)
cmd/kivik/cmd/replicate.go	70.83% <70.83%> (ø)
cmd/kivik/cmd/get_db.go	71.42% <71.42%> (ø)
cmd/kivik/cmd/get_cluster_setup.go	71.79% <71.79%> (ø)
cmd/kivik/cmd/describe_db.go	72.72% <72.72%> (ø)
cmd/kivik/cmd/put_security.go	73.33% <73.33%> (ø)
cmd/kivik/cmd/get_doc.go	76.00% <76.00%> (ø)
cmd/kivik/cmd/post_compact.go	77.77% <77.77%> (ø)
cmd/kivik/cmd/post_flush.go	78.57% <78.57%> (ø)
cmd/kivik/cmd/post_view_cleanup.go	78.57% <78.57%> (ø)
... and 28 more

... and 13 files with indirect coverage changes

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